Trigonometry and precalculus
Polynomial and rational functions

Completing the square and the quadratic formula

  1. Solving Quadratic Equations by Square Roots
  2. Solving quadratics by taking the square root
  3. Solving Quadratic Equations by Completing the Square
  4. Completing the square 1
  5. Completing the square 2
  6. How to Use the Quadratic Formula
  7. Proof of Quadratic Formula
  8. Quadratic formula
  9. Example: Complex roots for a quadratic
  10. Discriminant of Quadratic Equations
  11. Discriminant for Types of Solutions for a Quadratic
  12. Solutions to quadratic equations

Quadratic formula Use the quadratic formula to find the roots of a quadratic function.